Smokeless boiler-furnace.



No. 698,977. .Patented Apr. 29, |902.

J. G. LUEB 8|. J. HAGGE. SIMOKELESS BUILER FURNACE.

(Application filed Dec. 4, 1 901.)

(No Model.)

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UNITED STATES PATENT OEEICE.

JOHN G. LOEB AND JOHN HAGGE, OF ST. LOUIS, MISSOURI.

sMoKELl-:ss BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 698,977, dated April29, 1902.

i Applicationiiled December 4, 1901l Serial No. 84,626. (No model.)

To all, whom, t may concern:

Be it known that we, JOHN G. LOEB and JOHN HAGGE, of the city of St.Louis, State of Missouri, have invented certain new and usefulImprovements in Smokeless Boiler- Furnaces, of which the following is afull,

clear, and exact description, reference beingV had to the accompanyingdrawings, forming a part hereof.

This invention relates to smokeless boilerfurnaces; and it consists ofthe novel construction, combination, and arrangement of parts, as willbe more fully hereinafter described and claimed.

The object of this invention is to construct a boiler-furnace bringing acurrent of fresh air from below the gate-bars and passing the samethrough the bridge-wall over the fresh fuel, there being a solid wallback of and above the grate to support the fuel.

Figure l is a vertical sectional View of a boiler-furnace, showing ourinvention. Fig. 2 is a cross-sectional view of the same, showing thefront side of the bridge-wall.

Referring to the drawings in detail,"thev bridge-wall 1 is built with aplurality of airpassages 2, leading from the ash-pit backwardly belowthe grate, then upwardly to athe pillars 6 between the openings servingtov support the solid wall 5. The casting et is placed upon the solidwall 5 and supports the upper portion of the bridge-wall, said upperportion projecting forwardly a slight distance over the fuel, so as toforce the air coming through the bridge-wall to pass over the fuel. Theair-passages 2 connect with the airpassages 3, formed through thecasting 4, said passages 3 being long and flat, as required, to spreadthe air into thin horizontal sheets.

In building the rethe fuel should` be piled upon the back part of thegrate against the solid wall 5, and the re should be started upon thefront part of the grate. The gases of combustion arising from the firewill mix with the air passing through the bridge-wall and over the fuel,thus insuring a perfect combustion. The fuel piled upon the back part ofthe grate against the solid wall 5 will become heated and give off gas,which will `mix with the air coming through the bridgeh wall, and thisgas will be perfectly consumed when it cornes in contact with the fiamefrom the front part of the grate. Then this hot fuel is pulled forwardlyand fresh fuel takes its place. This feature of passing fresh airthrough the bridge-wall over thefresh fuel and not through it is ofgreat importance and is made possible by the solid wall 5, care beingtaken to place the fresh fuel directly againstfthis wall 5.

It has been found by experience that in ar ranging a furnace of thisconstruction the smoke arising from the fresh fuel is consumed.

We claim- In a boiler-furnace, the bridge-wall l built with a pluralityof air-passages 2 leading from the ash-pit baekwardly below the grate,then upwardlyY to a point some distance above the grate andthenforwardly to the fire-box, thus leaving "the solid wall 5 back of andabove 'the grate to support the fuel and to discharge Vthe air whichpasses through 'the bridge-wall above the fuel and not through the fuel,the

vlower ends of the air-passages 2 being formed rectangular in laying thebrick and the pillars 6 between said air-passages serving to supportVthe solid wall 5; the casting placed upon the solidwalf andv supportingthe upper portion of the bridge-wall, said casting havinglongitudinally;extending slots forming air-passages 3 and said upperportion of the bridge-wall projecting forwardly a slight distance overthe casting and over'the fuel so as to force the air coming through thebridgewall to pass forwardly over the fuel; substantially as specified;

In testimony whereof we afXour signaa tures in presence of twowitnesses.

JOHN l. LOEB'. JOHN HAGGE. Witnesses ALFRED A. EIoKs, EDWARD E. LONGAN;

